b2f5992412
Added a "Building and Testing with an Emulator" section to full_cross_build.rst using riscv64 and qemu-riscv64 as the example. Outlined necessary CMake flags for cross-compiling with Clang, including CMAKE_C_COMPILER_TARGET, CMAKE_CXX_COMPILER_TARGET, and LLVM_ENABLE_LLD=ON. Switched from CMAKE_SYSROOT to LIBC_KERNEL_HEADERS and added the gcc-riscv64-linux-gnu package dependency to ensure sysroot issues on Debian-based systems are avoided while retaining access to cross-compiler runtime objects. Explained the self-hosted libc-hermetic-tests target as the required target for executing tests during a standalone cross build, since the standard check-libc tests are not hermetic. Refactored existing CMake examples in full_cross_build.rst to use -S and -B flags instead of cd and mkdir. Removed prompt characters from code blocks and separated host environment setup into explicit code blocks for easier copy-pasting. Also removed the initial 'cd llvm-project' directory changes to reduce boilerplate. Added a cross-reference to the new emulator section in build_and_test.rst.
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.